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'Star Wars' droids

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R2-D2 and C-3PO, two droids from the Star Wars series are seen in this still from one of the original films. These droids are two of only four characters that appear in all six of George Lucas's 'Star Wars' films.Lucasfilm/20th Century Fox/Newscom

General Grievous, commander of the Separatist Droid Army in the film 'Star Wars: Episode III Revenge of the Sith' is seen in this still.Lucasfilm/ILM/Newscom

The battle droid army in the film 'Star Wars: Episode II Attack of the Clones' is seen in this still.Lucasfilm/Jak Productions/Newscom

Director George Lucas shares his thoughts with droid R2-D2 and actor Jake Lloyd, who plays young Anakin Skywalker, on the set of 'Star Wars: Episode I The Phantom Menace.'Keith Hamshere/Lucasfilm/SHNS/Newscom

Thousands of battle Droids get ready to march out under the cover of their large landing ships, to invade the planet Naboo in this scene from 'Star Wars: Episode I The Phantom Menace.' UPI/Newscom

In this photo, Mark Hamill portrays the character Luke Skywalker in this scene from the initial 'Star Wars' release, with the droll droid C-3PO. Lucasfilm/AP

Mailboxes across the US were dressed as the 'Star Wars' droid R2-D2 to celebrate the 30th anniversary of the sci-fi movie classic in 2007. Newscom/File

Robotic battle platforms, All Terrain Armored Transports, are seen on the Planet Hoth in this still from 'Star Wars: Episode V The Empire Strikes Back.'Newscom

Lego versions of R2-D2 and C-3PO are seen running from Lego Scout Troopers.Zuma/Newscom

Actor Kenny Baker (r.), who plays robot R2D2 in all of the 'Star Wars' movies is seen at 'Collectormania', the UK's largest celebrity signing.Newscom/File

Astronomers have found more real-life versions of Luke Skywalker's home planet Tatooine from "Star Wars" — alien worlds that see two suns rise and set each day instead of one. And these two newfound worlds are also extremely close to the habitable zones of their parent stars, scientists say.